The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 15, 1985
Filed:
Mar. 02, 1982
Applicant:
Inventor:
Kenji Fujibayashi, Tokyo, JP;
Assignee:
Olympus Optical Co., Ltd., Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
360 69 ; 360 741 ; 369 53 ;
Abstract
A tape recorder capable of sounding an alarm which indicates the end of run of a tape, includes a tape recorder control circuit which sends a first signal for effecting tape end muting and for sounding an end alarm. The first signal is supplied to a speaker through a power amplifier. The alarm issued from the speaker is sensed by a microphone and later acoustically fed back to the power amplifier through a microphone amplifier. The microphone amplifier has its gain substantially reduced to zero upon generation of the first signal. Even though an audible alarm is sounded, howling which may otherwise arise from the acoustic feedback of the alarm sound, is suppressed.